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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Tiny black specs can be nectrotic tissues from bladder lining.
Recurrent UTIs can cause inflammation and dead tissue of the lining.
Another possibility can be bladder cancer related.
Small risk but should be looked into.
You should get urine cytology for initial screening test.
Cystoscopy also may be required for direct visualization of bladder lining.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star on top).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/